Stoker or moving grate



Patented July 28, 1925.

UNITED* STATES PATENT FRANCIS DE GBUCI-IY., OF. NEWARK, NEW JERSEY.

STOKER OR MGVING GRATE i Application led April 25,v 1924. Serial No..709,060.

` up of a plurality of grate sections, mounted CAD upona grate4 bar, and each section includingy asurface plate which may be removed kvfromz or applied' tothe grate bar without dumping the fire orv causing the stopping of the stoker.

vide a surface plate which is provided with a .plurality of openings Sov arranged asv to render'the plate free from all dead spots or plugged holes and which permits the draft from beneath the stoker to penetrate Ytheentire surface of the plate, thus assuring a complete consumption ofthe fuel during its passage through the fire box.

A further object of the invention is to provide a grate section .which includes a surface plate which is interchangeable with respect'to the supporting grate bar, whereby surface plates havingdifferent size openings may be vsubstituted depending upon .the size v ofcoaltobe used..

ALstil-'l further object vof the invention* resides in the provision ofa means for permitting rocking movement of the Surface plate with: `respectto the grate bar whereby to' permit the surface plate' to move a slight v distance in order to pull away from the.

next adjacent surface plate whenipassing over the sprocket wheels ofthe Stoker.

With these and other objects in view, the invention resides incertain novel construc- .tion and combination and arrangement ofparts, the: essential fea-tures of which are ereinafter fully described, are particular- Figurei2 isr ai fragmentary toplplanpvievvv xofja `portion of the Stoker.V v@-'Figure 3 isla perspective view of one of thegratefsections mounted upon a grate. bar.

Figure 4 is a vertical sectionalf view.v on

- the linea-4fy of Figure 3.

Figure 5 is av sectional view 011- the line 5-5 of Figure 3.

Figure 6 is a detail perspective view of the surface plate and the carriage for supporting the same.

Figure 7 is a sectional view thro-ugh one ofthe end' grate sections. f Y

Referring more lparticularly tothe drawing, the reference numeral 10` designates, a Stoker grate in its entirety and` which is usually mounted for passage through a furnace 11. A` hopper 12; isdisposed. at one end of the grate and serves to feed fuel in they nature of coal to thev grate-. The furi `nace and hopper do not constitute a part Another objectY off the invention 1s to proof .theV invention but have beenV shown to illustrate the application of'my invention.`

AThe Stoker gratelOi in the present instance is shown as oomprisingpairsl of sprocket wheels 13 over which pass endless chains1 14. Power Vmayv Vbe imparted to the sprocket wheels in any suitable manner in order,v to

.. causev movement of the chains. .'-Boltedv as at 15 to the chains 14: arek transverse grate bars 16, and mounted on each grate bar are` a plurality of grate sectionsA 17 and disposed at the ends, of bars are end grate Sections, 18. There are suiicient number of thesegrate vsections to fill the space between the ends of ;the gra-te bars, and the number of sections depending'on the. width of the Stoker.

Each of the grate sections 17 comprises a base 19-A cast in a single piece and provided with 'a pair of spaced upstanding walls 20.

The Awalls 20 are each provided with aligned seats 21 for the reception of a pair of tubularl rails 22. 'The rails22- are held in their seated position by` plates 23 which are bolted or otherwise secured as at 24 to the base. The base is removably attached to the l grate bar by abolt and nut connection 25, the bolt of which passes through one of the -usual slots 26 in Vthegrate bar and through a 4slot 26" in the base, the head of the bolt being prevented from turning movement by a pair of walls 27 which extend the length `of the slot 26. A carriage 27 is slidably Vmounted on the. tubular tracks 22I andl is' formedwith spaced upright walls 28 vprovided with openings 29 through which the tubular tracks pass. The openings-29fare slightly` larger than the diameter of the tracksto permit .the carriageixto rocka slight* distance when passing over the sprockets for a purpose to be presently explained. Each wall 28 is provided with a pair of studs 29 for reception in recesses 30 formed in the un.- derside of the surface plate 31. The surface plate 31 is formed with equidistantly spaced openings 32, and the recesses `30 are interposed between certain of these openings. The openings are so arranged that no dead spaces appear on the face of plate whereby adraft from beneath the grate is permitted to pass through the entire surface plate for effecting a complete consumption of the coal. Y An opening 33 is formed centrally of the plate and through which a bolt 34 passes for threaded engagement with an opening 35 formed in the carriage 27. The bolt 34 permits the ready removal of the plate and connects the surface plate with the carriage for rocking movement therewith in one direction and for sliding movement therewith in a direction at right angle to the rocking fmovement. Thissliding movement permits Vthe surface plates to be moved flush against each other and permits of the expansion and Acontraction of the plate with respect to its supporting structure. The front of the surface plate 31 is formed with a trough 35 and the opposite end of the plate is beveled as at 36. The trough 35 is provided with lugs 37 for receiving the end of the preceding surface plate. It willbe understood that the trough catches the ashes which may dro-p between the surface plate when the plates separate as they pass over the sprocket wheels as shown in Figure 1 of the draw- Y mg. Should the grate bar 16 become warped,

which warping will tend to throw the surface plates out of horizontal alignment with respect to each other, I provide an adjusting means in the form of set screws 38 having threaded engagementv in the corners-of the 45' base. By adjusting the set screws, the level of the surface plates'may be brought into perfect'horizontal alignment at all times.

From the'foregoing description, it will be seen that I have constructed a grate sec- HJtion which permits the entire consumption of the fuel contained on the surface plate. Furthermore, the surface plates may be l easily removed when thestoker is in motion by removing the bolt 34. When applying the plate, the studs 29 are seated in the recesses 30 and when in position serve to align the opening 33 in the surface plate withr the threaded opening 35 in the carriage Y to permit the ready insertion of the bolt 34.

Y Thej opening 33 is slightly larger than the diameter ofthe bolt to permity circulation ofair therethrough for supplying the proper draft of the coal'about said openings. It

' willi-be seen that as the grate sections pass l downward over the sprockets at the end of 3the Stoker, the surface plate will rock-.with

the carriage to permit the next adjacent grate section to separate therefrom and which tends to prevent a binding action between the sections at this point. The carriage being slidable allows for the expansion and contraction in a transverse direction and permits the surface plates Vto be brought into contact with each other. By providing the tracks of tubular material, itA will be seen that the ldraft is permitted to pass therethrough for cooling the tracks.

Each end grate section 18 comprises a surface plate 39 of a construction similar to the surface plate 31 but is provided with a depending bracket 40. The bracket 40 is provided with a square opening 41'for the reception of a square nut 42 which nut has threaded engagement with a bolt 43 passing through one of the slots 26 in the grate bar. These surface plates may be removed by un- Vwith the nut 42.

Ihile I haveV described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the details may be varied without in any way departing from the spirit of my invention and I therefore do not limit myself to the exact. details of construction herein set forth no-r to anything less than the whole of my invention limited only by the appended claims.

I'Vhat is claimed as new is 1. In a stoker grate, a grate bar, a grate section including a base, means for removably securing said base to said grate bar, a surface plate, and means for mounting said surface plate for movement on said base, said last means comprising a pair of tracks supported by said base, and a carriage slidable on said tracks upon which said surface plate is removably supported.

2. In a stoker grate, a grate bar, a grate section including a basa-means ,for removably securing saidbase to said grate bar, a

Asurface plate, and means forV removably mounting said surface plate for movement on said base, and means forv adjusting the level of said surface platexwith respect to said grate bar. f

3. In a stoker grate, a grate bar, a grate section including a base, means for removably securing said base tovsaid grate bar,

' a surface plate, tracks mounted above said base, a carriage slidable on said tracks, an

Vopening arranged centrally of said surface j plate, a bolt passing through said opening riage movab'ly mounted on said'tracka a surface plate, and means for removably securing said surface plate to said carriage.

5. In a Stoker grate, a grate bar, a grate section including a surface plate, means for removably mounting said grate .section on said grate bar, means for permitting the sliding movement of said surface plate in one direction, and means for permitting rocking movement of said surface plate in ka direction at right angles to the sliding l0 In testimony whereof I havel aixed my l5 signature.

FRANCIS DE GRUCHY. 

